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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf26c1372e8e3de5587fff9b7344d5a79b20c9f51654d9ad140f1f848b25d5e' 
  AND token = '1aWYgHyNeIPzN7O4snLQclG3fXdyipWJXmYS20cGGtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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