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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6314bacd029a1eb8e3d53531e8a08b426166e3a2286c2ea603c6fad50b28d43' 
  AND token = 'efpb1Jw5fxngPGwjT+tRlKVk0g6wOzE2b1skF0cxHr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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