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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09a11d10bcbf9a7c12dfc99c85c79e6288de3d12beee54e80532e0fde7581c8' 
  AND token = '5z6q+dwcD688jbFNO8ktqNxOj5SEENHsCln4DaL+utk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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