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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d22b1aee5c133f4c1ca8fe54ab03724fa61bfd0033e39b3dc2ef649ac56fbf' 
  AND token = 'KPGj4RBuRArII2fOtb6TkgdmDqKWUAjBicsx+gtGK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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