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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369ddf897ef6d33f769b51d3bc1e56d4335c119ffc185bd7438bd33332161354' 
  AND token = 'gI+UOZ3KUto+IerIXnPISaQZE5wzA3QE8pO/vorIPaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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