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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a230be91b7cd3fae11ee1298a9200d29ee69ee0fd971d72bbd329396208933' 
  AND token = 'IyXaychmFrNV5J0gKEqoP1m5vfZYVFn2WLGB57AScY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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