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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4171fab8866528532ccb9ba83923ea21707e057ff07df45fef1b56f0aa0258d6' 
  AND token = 'sr7aihUxXhndFHFNyJ3sZWeWUudXoZB2C8kCIzuH17c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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