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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468c3c4a808a28f6db16e86258b0c23bb99d1b46a99b736cfbe5f865177679ee' 
  AND token = '1nPDk54IBZrl6wAdmOuX1vbUMRGi8qXBbxMxTsHBlZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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