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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea6193eef3a57c3ad00e3ae6dd6cc1beea35359472f194add93099599a59f2' 
  AND token = 'NbBGl6vg/iQhhiocuzAJI9dDmEmosDnIEIHSbZXMU4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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