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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c60ad08e9ff6aa25f4b17c14a6d5613b19f9ed74e2d4abad8918fc8bae56e02' 
  AND token = 'UW8K3VE6NtRf38SpXxHQb704JESo7EkkoaLe9XBZa9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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