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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9404e21bf1d66a3465a315af16959304b9fed79c11500fa1b85ff5a30fe74922' 
  AND token = 'jparfc3vij6ADXHfEEK9mq9Yu8FCTdbxC/LqtEW0Bfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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