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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ef17771dfd6f24b7aa661132695e0769939d9a9e181db3db9a487c732cd4fe' 
  AND token = '/GAtNd7MYbF39lB5y4dP7hRG63RqDk/qIBplri80S5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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