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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954e5d05afab552d424d9ff470fa614473e02dde29302f26c0be523904af3adf' 
  AND token = '8zrV1sSWideeDmVZ2T1txi89Xt13xZ82J9YWYwMAVNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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