SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b97d74904fc83192d3f9b750ac222e6a8a067b613fbefccacdb0a88599aab08' 
  AND token = 'tNVWLHL8D7YzOE01Y0/rDl7CADmLM7i9OrbdSs13n3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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