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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691058f5e8524a1ee394f341819802ebf5b5105d1b1566ab7a10a8da043864cb' 
  AND token = 'oe82IVqRPhsJiObUp4M63dlLG5AgTckgGQeRplxHsqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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