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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f83363150e964bd7b07fdfaa8ff1eb5b8cb0b890de676bc3299d15d91d416' 
  AND token = 'XLB1AQH9lsQ+7qvJNTmDqze148xFTJ96GsOvtbplHW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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