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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50920432d65e1337597840f36aeb1a6420c2fb1c8006f228a736c913addd2d39' 
  AND token = 'e9l/zvoOcJGm0XETvFoCg8eQp8vKO9uYPSg0JvtHu0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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