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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117c522e14e9e495fca59ef57ef0ba565421ad8531058b55e244c0d3194f37ba' 
  AND token = 'i1zA8Q1dewsnI7bt9hlavnDB9wXn+k67WxdqTv+NL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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