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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87171e0f4302f86ac3b7d99284f6f110a921b2b6b6d31941b29abd7f73fce8a4' 
  AND token = 'J/DQbS3kUXzEjdgNfkUbeexgH3tMYlWlscO9+wo6qI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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