SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac53f77b9af172029102bcf44ef3bae6cc087daa6315f82dfe46f4d20777acaa' 
  AND token = 'qH9rucYn5FFSMhNfzoBjJiYGuIQKs1X8zVdO+mIR96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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