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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb234df94dee573e2ee76048554f6faeba6959d6b8f75f5f8df46d1bdafa7b1' 
  AND token = '8eN06VbBc0u9wPtJnaOg8ymkSX9IWm//w5LOWSq9EMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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