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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57bf3b50a393c83dbd4760963e340f3592f265cade2b0da2dbaf8ab42273c9' 
  AND token = 'KvNdUZ3VX3OZOQ+a8zv/DdE4dCvuToPqJGUN65r45WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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