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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5dfb7b88ee91e7b51f249874f94c11ea7f9cc2cda8ffbc3b2911f42267f5ff' 
  AND token = 'WlLKwIlHUWjwIqjqYn9cj4h8YLy41oH9kvWsbdQFYW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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