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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59bd0efd499080ec26ff516c9d02a6861440c0f7ee7242a9216d97316774ef5' 
  AND token = 'j5SfKcD9xrkfpDIU5A6p9+g+zx48fnR27p3vYIY8U1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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