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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b907559b301e495b13cad4d8e37d1ebe74438ee1554dd15dd6bfde274f6507a5' 
  AND token = 'XEprmicGMv0Qf1yRJ1rt+L3SlK6548GW1pllCbPeT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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