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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1fd63ee937ffb96a851fac32cb5e024cf36c609f28ef766ba9942a2a9ce71b' 
  AND token = '9VKEIjb57uaWd2YeXtTKLPD3I7yJKBvDnxv8cy14xoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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