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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813dd5a34f7750c411e299927322f46d0288dcc9362d112ecd2ed15fa3ca62bf' 
  AND token = 'A7oX8VUPo/Xn6DZb6WEr9YtoCiOPBVuEWATwmla/qwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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