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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28009ebae9452a9750a266168c23fddc9b91785cd56bdcc1732ec695860e7b4' 
  AND token = '0gYF0qTvBN9N1snVPJH8LtRNuzkNOfJW3KBgEx4e0rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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