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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3579fcadad5e3a6c1c108f4b64f4755c6be8b338d4c651cae2ab93827b3bebcb' 
  AND token = '4ZizVCO2NzM7feKNAE/0PLCLMpzXkKrgzbk2P3yfeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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