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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd01a4ec29ec77750b9a53caac0a5f060b9615fbbb46f2ba83e3d7ba1429f8a7' 
  AND token = '5ldN/JikXhrAExlwNEM35YNAwVQA5qYOr2CQk2Wj7Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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