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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ab07d142820647edb8fbcd45a9ba139ac481f926309e21bebdda682f1d63a6' 
  AND token = 'dOg2mKje1F1DuTj4gceNESBXBWfpF0r9D5Y9UvOm8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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