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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71a31e8b3ca9c9d662e79b64a0d8b60840b50b252c2b1c6b8a4c369e636cd24' 
  AND token = 'xWAdwpDYqMQVHNwk9BkgEJofvYkh46g2poFCYXt7Q8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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