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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61f2e4db41adb6cb01c02508418667e80241868e2ccb7fa5f6b2672b41d29c2' 
  AND token = '79ZfAQK8jgLuYSTvsZsoq3OMJF4Pwp8sVjKyFR8tUEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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