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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bb77e3aee71817c83d2edf819d7b6fbad702d07a514e60f34501041b160e26' 
  AND token = 'He+i3LnMF5FtExs31Cdle2DF45psqpUovJw/jEN42o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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