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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae8bc16a459e0305f142d0f17ea3158ea85e2880441f4cd9c2118091e80434c' 
  AND token = '5Be6GpddoVmLXSDJuew/RtS8+kD0XDxXd022D/donkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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