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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff139361a82b55cfa951242c63dd1b23e1067f339b4ca9910268b97128c960e2' 
  AND token = 'X736pJNlaCWIcA9s+AbgBgWJfLGYnyhipQatUvSx9aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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