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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14747d7e01f35bc681bf323b28b2ad9e5b4985ee3b8aca58f3731005eadf4e77' 
  AND token = 'Kr46se7e6stPJOwU2hsEviXYjT9H51FS87fKWo95gag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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