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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91316a81971501ae327c1ef03dcca6a8330adbb38fb5deec4f6f10c4bd9f435b' 
  AND token = 'Vrhb9r9RxCDKnih36TheD8M522YxoLr9G7kibw6mzsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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