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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8cdfc436c70ec25a021a3cbb6090444b958d440241c44b448ad5cc1fb9b65d' 
  AND token = 'zTSGdfq+5mSi4n95rsU15rtK5muiqXDzN3lUe89t0f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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