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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae2bbe56ddbb886b8f25e438c73122c42fdc972c873fc51c3566f6085490bc8' 
  AND token = 'dIidPXiNSpBjvTMaGe9LmAhUXlNcXe3BwK3mNZInPtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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