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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb19bc766c1dffe72fa7ffd0e7d299df5723ba32eadef4de36b5634d83e7297' 
  AND token = 'WMKbDXO34fLq+mUBerj+V8Dac9dXWdM1N6hcP3303nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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