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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13e460e96ec5da06ad4bb6f171b297058441e99a330c7e26520dd5603cce9ac' 
  AND token = 'DPwgG6IICklBXoHLjWcj5xyiGjObw8dxtaRzbNeLYX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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