SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed854fac5fd81db3bc467bbaf7e3415def2f0f7f8d3a6f9d46a588cf2c583a1' 
  AND token = 'sxLxh+k4qPd/gunVt/ZyzgDMjTHv2FVgvzB4Rog0FNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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