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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa2e7d2f1aecb77483160f4e2e8c49f0fb081a9934c820fc65c86ced5701369' 
  AND token = 'N9V2XDG5gUeaK6EzWERBt7HxyUn6xGDi2yAnFGOLfNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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