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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60d82bb4b388ead3d6790554dbe7d746e005098d496d12a67fa24f498eb031f' 
  AND token = 'VzQPU/XzmrPl224uAzobH5p44fvrn2cviDjpA7fdoWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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