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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace03934134c41e19f8373c189959be2eb64465da74055f72874a0be2316db11' 
  AND token = 'abLQzP9EgQ/T74RxIhybYFw0lcho+WixcH/inwJO8Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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