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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf6b1516442616a70202206d095fdf2c15bb0f6b52144dd2b5005e48330d5be' 
  AND token = 'zUSuy9nkpPQrwafG3rC3eMMpHz52u/RPYwjt4lBVox4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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