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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c868d74cf94e9ed40a66449e4696c4c9fc08ee5d9fec066bc82271f7c2c6c7' 
  AND token = 'Q9Zji7VWQo0z6Qe79KxnseW527Ze618tD5yttRFfW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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