SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f9fd7856e7de2717404768c2f5456634cc12d34a55567bff3fa14dda53d16b' 
  AND token = 'vK4k6/mgZWRo1Vut/kZuJ+FhZjdL+8MyngXbsIjgeoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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