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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c4f3b8e08d2315da82a771c2f4416d224d9737607c8c173149337ef99a564e' 
  AND token = 'TyplueaTFsYAP3P9sUSm67/jYoctNE03CoXWgLwUWbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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