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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f99b4d8781bb71bcbf432c8f03452f19988d3dde09994bdaace78c10da3a35f' 
  AND token = 'f1IXTwG//DTrvWv9kbz5488Q5KBlS9QAL8+BM9c2A80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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