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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b90f7c0cdb7f5eec98f4ddf8d0fcd0d08a4fc45e55876e0172c7cc20b6aab73' 
  AND token = 'UbwYHNk11JL5kHQbTXGqgstSZoChyDl0HO/IG9FjrA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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