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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462b6a85cbf03353ebed30ff63993f31e7f56ecffc5f522f1d173b370b96438f' 
  AND token = 'kmoksO6oa52Zx0uCRh7S0brtK1tElmSA4/959CdqIV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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