SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b97f1d58dce133e2347184b226450918b09ed53af49f59dfc4ed7a66ecd2db2' 
  AND token = 'OoJJanM0HVfUJlGkVBCBjuWxpmG2UxMBFUc6RzHaqFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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