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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf76ecd121ce3c248fbe810501447695744930df78ede733e1cfb94eb1916787' 
  AND token = 'd/x3VpJy2l8YOsAUp5/RFiHEu4uVfNCsYFFfKvnmITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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