SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabc0aab3c6d7b2dc6f98916e78b15155aceedfe02522040164c655c87b56f61' 
  AND token = 'Cwh2Pw4Ke20HZnvXuv/NNrAPYCpznqDYnh31ADVOHJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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