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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2689f3a4fbbabe5ce89c55b4c99f7f512a7f6307ec86e2efeef1fe6c41e9f67d' 
  AND token = 'M/u9TLq9vVZ4DPyim4yUMzlTDLoQsK0hUN5hUYrUvLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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