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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cae6ebe7469c6e95f8b5ae4b9f9c29ed01b959c93c670d741ee74b971287cf1' 
  AND token = '4v9znC9azojAcloVcMf6bCMVTHKwov1bCTBjbQFKRgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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