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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e1b443702b91468239809f0df463d89e1b9632e04c0fe965b24d6f61250068' 
  AND token = '6XgfZb3avoczzn8ngXynKzLQdqkGSKjWVaUTfG7rTPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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