SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bc5279182c9d80f363c523d486dd1654c2a690ac32665a57fe96ab5d634166' 
  AND token = 'uxZI3tNPEDxlYwU1w4UBv2/eBPpDQt8YvpsZwVLUsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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