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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a757e69d5882d7e6617fee1a827f548986ba345320c61bcdcc81fea3c87131' 
  AND token = 'tilW4jPQLwf87ODcEwnA6WJLCDN2baKxY+TyCoNo01A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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