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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980f61a5f7eef6a84e0ac627e19a519f6605bfebd6993905c6db0ea7209753e3' 
  AND token = '0VZIb+9wE3xPOGQyqQKVhF1mitF/8Gs8YS0DL6C9xe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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