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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cae061cd3e989ed89cd0d02d7671ec9a25c0bd66f30f7663cef5128115b61f0' 
  AND token = 'a+oUqTak804BTsaMN+koUiEfMf/HDCblG/kseDssiyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}