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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b80ceabd8421c57d4b8fe7d4b24bdfca4fab76ed928e1fbbd4dfb2869692fa' 
  AND token = 'VK3cm+MYc3AwpheECvZ4Fw8ki5nyGUNfHFvhPRzmzNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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