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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8208f90f34beacb52f216563e927e1c61da85983624e462c395dc6e4ccdaef6' 
  AND token = 'qx6HoPu3dzUlW9GFGuOFbZ57rYv0TI+MRAXEkqDpddo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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