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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39b3ff427cb53ca217a7cc4df7adffb7e11d17c7425411cef3323054b0d3a2e' 
  AND token = '5lNKg5sp/GDQsrWo5q+m0/94cJQwZZ1qYafHuixhfrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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