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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0174e33e0d495f668f79278abc48b7ef0766c1d823faca77804a641d7b0aeac7' 
  AND token = 'dBpgOB5DxFe0phUwmfD1VufcEYWO2JOIO5C/8IW/Bek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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