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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61768a7136a18551ee2ea94ef0f7e97981b029761f1f6f99004bc70789060d07' 
  AND token = 'p9vZqxyInsruB/pj9OBqhf1qMpUKoSMxz8qhvGZsx9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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