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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08eafd16b578f9156ca80f43bb6d22e76cd72aeab579e5407018fc30b4d4e4d2' 
  AND token = 'FQAMyj/8h287i9j0/mYVPeVTZWtrMdHqzN9N6nEInVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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