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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4999276e2ff141c054faab6ce2ad5ec71d326e1d2ede35c373b5575c2c8ff9f' 
  AND token = '96qjC0IVg1O3gMLqi+SymNyUGqHq+oGCU29QywnffWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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