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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c60cc1094f4c0f69c83e89596f8c69decb39815c16b0b3e7e4bd894e303d7a' 
  AND token = 'WvkfOJFvg8VJERJcKv8rDx+HuK8qmNfemq2/Ar8bHXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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