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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c04c403c7c7b81a93082c5316dbbf837d22727a771d91d13fdfa5e661c29af9' 
  AND token = '129qWm7ktUjU0QMV4uMNjVOEXx4arHQ5ICdsz6sQ2FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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