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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad494db2b0a8d79f40a116f44fb94a663b02d6c4cd4fa881e1ec2c40d0ab53b8' 
  AND token = 'xpHEz0cIdkq0J2iW/l/MnzSihWJtT6VfsDS0cUaep/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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