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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca30a3ec47a3d1305674805164941e5829817bc6b6f7a6cfdf1e7f449186e083' 
  AND token = 'wAbnybrBKOlp2Ebh6qBjyIc+PjRqjDuAh8t1SCU8nos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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