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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c047ff36d94d22051e1f6f2352f4597ad6852ab49bd4f10dddb70d6aa5465d2' 
  AND token = 'Wln+L9w5AfrnSyvjQLGgfpb2NZMcO6yEKkd/WBdkjIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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