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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87840c3ef8f013e937b56373a60bd589f17c8f7ccef446e99f5ca2aeece51e64' 
  AND token = '0mh4g8lpvrMVDqIYO8HYLzgKJghOMa9T5kXPzYxHP9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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