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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144de8fb7936dfff747fbe9860091918bf2866e4bc9276d3d7ef77d8c3a9eeab' 
  AND token = 'Ew36g6PhyZkuhnEyoVKoADZ7ja/f/gjsaYQQrBC+7HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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