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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b650cdc3c9efaabef5703f2e9ab1cbf01ebe2ce8d66d86231a5c7d4bd1ac9e6' 
  AND token = 'bqwjnlptNpVWS+Xye7rV0Yv10DWBX3prjz/1YeY3RlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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