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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add582f4116efd69eaf0f861fe910371acb3061cba82e361bd083962c863d0ac' 
  AND token = 'iDPr8bIMKl52Pp1Ua76en3dgGcT40rqfjI4aXUCai34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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