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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24831475665de7793f0cbf10fbf45b5f5dd032a53d1b0fdec88671fa54f1ecd1' 
  AND token = 'EZ41ea8uho30bwjOP/cdWrS/V1MWrWO08FeTVV7ZDzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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