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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10e2dad5251d48e8a738fb7fe81c1f6b56ca8bfd1ca0cca37fafef616a6e1ff' 
  AND token = 'bd9AvQ0yiw8jeGUMhvvQSHXGJKipn20+SL0tHHgPB18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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