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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf1c0fb501d708ad598ecc82f9ed8f77b100b3c93ac8cbd538f299d960a477d' 
  AND token = 'MW2p/qQt/rxzyIG6aHkJzoP0SWf5N70H5LLhljkwmrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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