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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d6d1378d0fa4700340bc68cf3cc99be313aef327d5c8636d25fa4c054f2443' 
  AND token = '/Pzvf0cVOobdIWcEiASuAYp6QgUpytad5RW3wCq/cL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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