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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119b3640f1506f78ee839c428d421f4867a7d59e9581f6e6a458b5c0fcf7dc40' 
  AND token = 'KD4y/bcK5FBPUvVaU9jhGvNc/WbOl13ORhWQlsF5D40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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