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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040cad84d1db8f6e846066a10b47e1d97956915fcc8b965965b47443408fe72a' 
  AND token = 'I53JbdsNjJT1RcA8aWfiXplrOfvAvHskDZaZeVmjRHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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