SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15f4ebc52a44541cce49679d94a0013a0359ff56d9ef830096867b36d2d7837' 
  AND token = 'ryShK5dTZUHEVRwvmMwIDIzOK6+K3YIYGBIGP1L6pa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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