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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef94ceac22c7feff3441d2808a7154189c32f4af54ecc3a6b9249205f5593a03' 
  AND token = 'OK5XGjYN5kduA5rJ/8VbU7uohPj9DnE+a/7E8DGC87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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