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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24662097e65df48f36605f1bd46dabdf5e779a00d56eb5597ad317064cf9b053' 
  AND token = 'g3LIwl/e2lg0oLs60QoMq/ssPFsJ0kH2wzRdf6odQx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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