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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb730720dafe5a3ff567bbcb2884aa34e3137fd679e3b51af2cd7988ba70f3e3' 
  AND token = 'Aulkmxxa2tVi0Bd9zagkld8ISI79bYJe2kvaW+EEEiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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