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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebfab6769111ff0dca9d2a9638ef59952744381adb0d3a2199688b914d43a7e' 
  AND token = '3OuWXU2RfiurOwSlKBVvFu/yXTTBpc2NUY+mh02W0n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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