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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a090cdf12b30c6026315d8fcb7a23b81fc46ac4dc0e6f976c033b325567ad7f' 
  AND token = 's3a88bUBvfesExWNu2LZnUqfI6dgQXd8JHQTi64PosE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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