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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c8b41d720b229c50b1d033c16646d2a4e9cfef42f41f55f4103955c48a9e08' 
  AND token = 'y7nCfRdAyegUQoMkDUyd6rftpGk4GVzpfCUxM0WnOys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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