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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62809d833cd6d9971625deb8e3888f3a90f60e8ecba63a906ced0a1495d784ca' 
  AND token = 'J7HwFGemi+IDQwuKfCD5elfvBuR0PJsXbyy0rnYmRjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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