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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262fb762959a93a9d0fb04c0a3ad068246d228c39159108444daaddd7f82dd65' 
  AND token = 'sEvfk1KA1vLhql/vQRxSYnbxVaoYmWNCYzi6kVtyUGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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